The Infiniti QX50 (2019–2026) is equipped exclusively with the 2.0L KR20DDET VC-Turbo (Variable Compression Turbo) four-cylinder engine. This powertrain, introduced in 2019, has been the primary source of engine-related complaints, including knocking noises, stalling, power loss, rough running, and sudden engine failure. These issues stem from manufacturing defects in the engine bearings (main bearing, A-link, C-link, and L-link bearings) or supporting components in the complex multi-link variable-compression system. Failures can release metal debris into the oil, causing progressive internal damage and potential loss of motive power while driving.

NHTSA Recall 25V437 (June 2025) specifically targets 2019–2022 QX50 models (~84,536 U.S. units). The recall involves oil-pan inspection, possible oil changes/ECM updates, or full engine replacement. NHTSA's investigation (PE23023) confirmed elevated failure rates in 2019–2021 QX50s. A proposed class-action lawsuit alleges Nissan concealed the defect across 2019–2025 models. No major new engine recalls have been issued for 2023–2026 QX50 models, likely due to manufacturing improvements, though isolated complaints persist in some reports. Overall, the 2019–2025 QX50 has accumulated ~213 NHTSA complaints, with engine/cooling issues prominent in earlier years.

Background on Affected Models and Engine

• All 2019–2026 QX50 models use the 2.0L KR20DDET VC-Turbo engine (268 hp), which dynamically adjusts compression ratio for efficiency and performance.
• 2019–2022: Core of the recall population (production Oct. 6, 2017–Jan. 10, 2022). Highest complaint volume.

• 2023–2026: Not included in the primary recall. Nissan implemented multiple manufacturing process changes over time to address bearing issues, reducing (but not eliminating) reported problems in later production.

The VC-Turbo's multi-link mechanism places additional stress on bearings, contributing to the defects in early batches.

Common Complaints and Problems

NHTSA complaints, owner forums, and investigations report the following (typically at 15,000–100,000+ miles):

• Knocking and noises: Metallic knocking, rattling, ticking, or high-pitched whirring.
• Stalling and hesitation: Sudden stalling (including highway speeds), rough idling, vibrations, jerking.
• Power loss: Reduced acceleration, limp mode, RPM fluctuations, or complete loss of motive power (may not restart).
• Sudden engine failure: Seizure with metal shavings/chunks in oil pan/filter; some require full replacement.
• Other indicators: Check engine light (MIL), warning messages, low oil pressure, excessive oil consumption, rough running.

Bearing failures are progressive, often providing advance warnings (noises, lights), but can lead to sudden shutdowns. Real-world examples include engines failing at ~66k–98k miles with metal debris

found during service. No crashes, injuries, or fires directly tied to these incidents in NHTSA data.

Causes

Primary cause: Manufacturing defects in specific bearings or supporting components, leading to wear, debris contamination, and cascading damage. The complex VC-Turbo design exacerbates stress on these parts. Nissan made iterative production changes (e.g., to main bearings and L-link) over time. Issues are not primarily due to maintenance, fuel, or owner error.

Recalls, Remedies, and Manufacturer Response

NHTSA Recall 25V437 (June 2025):

• Affects 2019–2022 QX50 (~84,536 units).
• Remedy (free at Infiniti retailers): Oil-pan inspection for metal debris (~1 hour).
• No debris: Engine oil replacement (for 2.0L VC-Turbo).
• Debris present (confirmed by Nissan): Full engine replacement (up to 15 hours).
• Owner notifications began ~August 25, 2025. Do not drive if symptoms appear; park safely.
• NHTSA closed its PE23023 investigation in July 2025, deeming the recall adequate.

No engine-specific recalls identified for 2023–2026 QX50 models as of May 2026. Other non-engine recalls (e.g., rearview camera, airbags) exist but are unrelated.

Legal and Class-Action Developments

Proposed class-action lawsuits (ongoing as of 2026) cover 2019–2025 QX50 models (along with related Nissan/Infiniti vehicles). They allege Nissan knew of the VC-Turbo defects but delayed adequate fixes, exposing owners to safety risks and costly repairs. Symptoms cited match NHTSA reports. Affected owners may qualify for warranty extensions, repairs, or lemon-law relief.

Recommendations for Owners

• Check VIN immediately: Use NHTSA.gov/recalls or Infiniti's recall lookup (infinitiusa.com/owners/recalls-vin.html or 1-800-662-6200).
• Monitor for knocking, lights, rough running, or oil warnings. Stop driving and seek towing/inspection if present.
• Have oil analyzed or inspected for debris at an Infiniti dealer.
• Document all service for potential claims (warranty, lawsuit, lemon law).
• 2023–2026 owners: Fewer reported issues, but routine maintenance and symptom monitoring are advised.

References and Links

• Official NHTSA Recall 25V437 Report (full details on QX50 scope): https://static.nhtsa.gov/odi/rcl/2025/RCLRPT-25V437-0139.pdf.
• NHTSA PE23023 Investigation Summary (complaints and findings): https://static.nhtsa.gov/odi/inv/2023/INOA-PE23023-13019.pdf.
• Infiniti Recall/VIN Lookup: https://www.infinitiusa.com/owners/recalls-vin.html.
• Car and Driver Coverage (recall overview): https://www.caranddriver.com/news/a65299070/nissan-rogue-altima-infiniti-qx50-gx55-engine-failure-recall/.
• Class-Action Resources: https://topclassactions.com/lawsuit-settlements/lawsuit-news/nissan-class-action-claims-engine-defect-in-altima-rogue-infiniti-qx50/ and ClassActions.org (search Infiniti QX50 engine).
• Reliability Summary (2019–2025): https://theweeklydriver.com/reliability/infiniti/qx50/2019-2025/.

This report is based on NHTSA documents, recall filings, news reports, and reliability data as of May 2026. Verify your specific VIN, as additional updates or actions may occur. Owners of 2019–2022 models should prioritize recall compliance due to potential safety risks.

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